Win 10 reinstallation

Hi support team,
I have to perform what in subject on my mini pc.

How to find files and product code for the activation ?

thx

Once Windows 10 has been activated on a PC there is no need to give in the activation code from Micrososft again when you reinstall the OS. Microsoft has stored this already.
Before you reinstall Windows 10 on a PC you should have all neccessary drivers at hand in case Windows cannot find them themselves during the installation. Even if you have no drivers from Chuwi you still can make a backup set with freeware: Double Driver collects all drivers that do not come automatically with Windows and stores them. You then point to this folder (for instance on an USB drive) when the device manager of Windows shows that specific drivers are still missing.

Perhaps this answer will also help:
https://answers.microsoft.com/en-us/windows/forum/all/how-to-re-install-windows-10-without-a-product-key/523e6231-88bf-4764-8235-412f2bfc257e